Hi All
Hope someone can help with my understanding of the constants page.
If we consider a 4 stroke engine.
Am I correct in thinking the number of cylinders in the constants page is saying how many pulses the MS gets per 720deg of crankshaft rotation ?
So for a 4 cylinder engine set to 1 squirt and simultaneos staging, does MS fire in injectors every 4 pulses of the ignition input ?
What difference does the throttle body or Port make ?
Many thanks
Barry
Constants and how MS works
Forum rules
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
Forum rules
Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
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detcollector
- MegaSquirt Newbie
- Posts: 12
- Joined: Tue Oct 26, 2004 3:41 am
- Location: UK
As no body else has replied:-
You are correct with your engine cylinder/cycle understanding.
But don't think you can fudge the cylinder number to get the injections right as the number of cylinders also tells MS how many ignitions there are for a cycle and hence it claculates the RPM.
I haven't looked at the throttle/port parameters but pressume thats so it knows if you have throttle body injection or injectors for each port.
You are correct with your engine cylinder/cycle understanding.
But don't think you can fudge the cylinder number to get the injections right as the number of cylinders also tells MS how many ignitions there are for a cycle and hence it claculates the RPM.
I haven't looked at the throttle/port parameters but pressume thats so it knows if you have throttle body injection or injectors for each port.
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jsmcortina
- MegaSquirt Guru
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Re: Constants and how MS works
None at all - the code doesn't use it!bazzer wrote: What difference does the throttle body or Port make ?
I'm assuming that a VERY early version of the code had planned on using it but that never got implemented and no-one noticed to remove it.
James
My Success story http://www.msruns.com/viewtopic.php?t=8008
MS1/Extra at: http://www.msextra.com/manuals/MS_Extra ... _Index.htm
MS2/Extra at: http://www.msextra.com/ms2extra (runs on MS2 and Microsquirt)
MS1/Extra at: http://www.msextra.com/manuals/MS_Extra ... _Index.htm
MS2/Extra at: http://www.msextra.com/ms2extra (runs on MS2 and Microsquirt)
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Bernard Fife
- Super Squirter
- Posts: 1009
- Joined: Mon Feb 16, 2004 3:15 pm
James,I'm assuming that a VERY early version of the code had planned on using it but that never got implemented and no-one noticed to remove it.
Yes, I think that is right.
If I recall correctly (which is 'iffy' at the best of times) Eric never removed it partly because I think there may have been eventual plans for it (perhaps for things like 'auto-generating' warm-up enrichments, sort of like the VE table estimator), and also to maintain continuity (in case someone else with a custom code was using it).
But for the official code it has always been a 'placeholder' rather than a variable actually used in either MegaTune or MegaSquirt. Interestingly, with X-Tau accel enrichment on the way, it might be useful once again....
Lance.
Just below where the manual says to set the 'Port Type' under the title Before Starting Your Engine it implies that the TBI setting does do something.
From Manual
From Manual
If you have a throttle body injection (TBI) system, verify that there is a small squirt of fuel (equal to the “prime pulseâ€) when MegaSquirt is powered up (by turning the ignition key to run), . . .